    //此处引用：鼠标滚轮mousewheel插件
    ! function (a) {
      "function" == typeof define && define.amd ? define(["jquery"], a) : "object" == typeof exports ? module.exports =
        a : a(jQuery)
    }(function (a) {
      function b(b) {
        var g = b || window.event,
          h = i.call(arguments, 1),
          j = 0,
          l = 0,
          m = 0,
          n = 0,
          o = 0,
          p = 0;
        if (b = a.event.fix(g), b.type = "mousewheel", "detail" in g && (m = -1 * g.detail), "wheelDelta" in g && (m =
            g.wheelDelta), "wheelDeltaY" in g && (m = g.wheelDeltaY), "wheelDeltaX" in g && (l = -1 * g.wheelDeltaX),
          "axis" in g && g.axis === g.HORIZONTAL_AXIS && (l = -1 * m, m = 0), j = 0 === m ? l : m, "deltaY" in g && (
            m = -1 * g.deltaY, j = m), "deltaX" in g && (l = g.deltaX, 0 === m && (j = -1 * l)), 0 !== m || 0 !== l) {
          if (1 === g.deltaMode) {
            var q = a.data(this, "mousewheel-line-height");
            j *= q, m *= q, l *= q
          } else if (2 === g.deltaMode) {
            var r = a.data(this, "mousewheel-page-height");
            j *= r, m *= r, l *= r
          }
          if (n = Math.max(Math.abs(m), Math.abs(l)), (!f || f > n) && (f = n, d(g, n) && (f /= 40)), d(g, n) && (j /=
              40, l /= 40, m /= 40), j = Math[j >= 1 ? "floor" : "ceil"](j / f), l = Math[l >= 1 ? "floor" : "ceil"](
              l / f), m = Math[m >= 1 ? "floor" : "ceil"](m / f), k.settings.normalizeOffset && this.getBoundingClientRect) {
            var s = this.getBoundingClientRect();
            o = b.clientX - s.left, p = b.clientY - s.top
          }
          return b.deltaX = l, b.deltaY = m, b.deltaFactor = f, b.offsetX = o, b.offsetY = p, b.deltaMode = 0, h.unshift(
            b, j, l, m), e && clearTimeout(e), e = setTimeout(c, 200), (a.event.dispatch || a.event.handle).apply(
            this, h)
        }
      }

      function c() {
        f = null
      }

      function d(a, b) {
        return k.settings.adjustOldDeltas && "mousewheel" === a.type && b % 120 === 0
      }
      var e, f, g = ["wheel", "mousewheel", "DOMMouseScroll", "MozMousePixelScroll"],
        h = "onwheel" in document || document.documentMode >= 9 ? ["wheel"] : ["mousewheel", "DomMouseScroll",
          "MozMousePixelScroll"
        ],
        i = Array.prototype.slice;
      if (a.event.fixHooks)
        for (var j = g.length; j;) a.event.fixHooks[g[--j]] = a.event.mouseHooks;
      var k = a.event.special.mousewheel = {
        version: "3.1.12",
        setup: function () {
          if (this.addEventListener)
            for (var c = h.length; c;) this.addEventListener(h[--c], b, !1);
          else this.onmousewheel = b;
          a.data(this, "mousewheel-line-height", k.getLineHeight(this)), a.data(this, "mousewheel-page-height", k
            .getPageHeight(this))
        },
        teardown: function () {
          if (this.removeEventListener)
            for (var c = h.length; c;) this.removeEventListener(h[--c], b, !1);
          else this.onmousewheel = null;
          a.removeData(this, "mousewheel-line-height"), a.removeData(this, "mousewheel-page-height")
        },
        getLineHeight: function (b) {
          var c = a(b),
            d = c["offsetParent" in a.fn ? "offsetParent" : "parent"]();
          return d.length || (d = a("body")), parseInt(d.css("fontSize"), 10) || parseInt(c.css("fontSize"), 10) ||
            16
        },
        getPageHeight: function (b) {
          return a(b).height()
        },
        settings: {
          adjustOldDeltas: !0,
          normalizeOffset: !0
        }
      };
      a.fn.extend({
        mousewheel: function (a) {
          return a ? this.bind("mousewheel", a) : this.trigger("mousewheel")
        },
        unmousewheel: function (a) {
          return this.unbind("mousewheel", a)
        }
      })
    });

    $(function () {
      var i = 0;
      var $btn = $('.section-btn li'),
        $wrap = $('.section-wrap'),
        $arrow = $('.arrow');

      /*当前页面赋值*/
      function up() {
        i++;
        if (i == $btn.length) {
          i = 0
        };
      }

      function down() {
        i--;
        if (i < 0) {
          i = $btn.length - 1
        };
      }

      /*页面滑动*/
      function run() {
        $btn.eq(i).addClass('on').siblings().removeClass('on');
        $wrap.attr("class", "section-wrap").addClass(function () {
          return "put-section-" + i;
        }).find('.section').eq(i).find('.title').addClass('active');
      };

      /*右侧按钮点击*/
      $btn.each(function (index) {
        $(this).click(function () {
          i = index;
          run();
        })
      });

      /*翻页按钮点击*/
      $arrow.one('click', go);

      function go() {
        up();
        run();
        setTimeout(function () {
          $arrow.one('click', go)
        }, 1000)
      };

      /*响应鼠标*/
      $wrap.one('mousewheel', mouse_);

      function mouse_(event) {
        if (event.deltaY < 0) {
          up()
        } else {
          down()
        }
        run();
        setTimeout(function () {
          $wrap.one('mousewheel', mouse_)
        }, 1000)
      };

      /*响应键盘上下键*/
      $(document).one('keydown', k);

      function k(event) {
        var e = event || window.event;
        var key = e.keyCode || e.which || e.charCode;
        switch (key) {
          case 38:
            down();
            run();
            break;
          case 40:
            up();
            run();
            break;
        };
        setTimeout(function () {
          $(document).one('keydown', k)
        }, 1000);
      }
    });